Bob Moler's Ephemeris Blog

Ephemeris for Monday, July 30th.  The sun rises at 6:27.  It’ll be up for 14 hours and 42 minutes, setting at 9:09.   The moon, 2 days before full, will set at 4:47 tomorrow morning.

At 10:30 this evening the bright star Deneb in Cygnus the swan will be high in the east in the tail of Cygnus the swan.  Deneb is the dimmest star of the summer triangle.  Of the other stars of the triangle, Vega is nearly overhead, and Altair to the south.  While Deneb’s apparent magnitude, or brightness as seen from earth, makes it the dimmest of the three bright stars, Deneb’s vast distance of possibly 1,500 to 2,600 light years makes it nearly 100 times the distance of Vega.  If brought as close as Vega, Deneb would be several time brighter than Venus.  For all this it is only 13-21 times the mass of the sun.  It will have an extremely short life and it will explode, go supernova, in perhaps a few million years.

Times are for the Traverse City/Interlochen area of Michigan.  They may be different for your location.

Addendum

Summer Triangle. Created using Stellarium.